In progressing from full Moon to new Moon is the adjective

In progressing from full Moon to new Moon, ____________________ is the adjective used to describe the change in shape. (fill in the blank)

Solution

Lunar Phase

The lunar phase or phase of the moon is the shape of the sunlit portion of the Moon as seen by an observer on Earth. The lunar phases change cyclically as the Moon orbits the Earth, according to the changing positions of the Moon and Sun relative to the Earth.